Concurso Policía Nacional is an Android application developed by Ruben Castañeda that aims to help candidates prepare for the promotion exam to the rank of Subintendente in the Colombian National Police. This free app provides random questions on various topics related to the exam, including law, human rights, and police procedures.

The app's interface is simple and user-friendly, with easy navigation to access different categories of questions. The questions are multiple-choice, and the app provides instant feedback on the correct answer after each question. The app also tracks the user's progress and provides a score at the end of each test. Overall, Concurso Policía Nacional is a useful tool for those preparing for the Subintendente promotion exam, providing a convenient way to test their knowledge on various topics related to the exam.